要使用Spring Boot實現OAuth服務，可以按照以下步驟進行操作：

1. 添加Spring Security和OAuth2依賴：在pom.xml文件中添加以下依賴：

<dependencies>
    <!-- Spring Security -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-security</artifactId>
    </dependency>
    <!-- OAuth2 -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-oauth2-client</artifactId>
    </dependency>
</dependencies>

2. 配置Spring Security和OAuth2：在application.properties文件中配置以下屬性：

# OAuth2 Client Configuration
spring.security.oauth2.client.registration.<client-id>.client-id=<client-id>
spring.security.oauth2.client.registration.<client-id>.client-secret=<client-secret>
spring.security.oauth2.client.registration.<client-id>.redirect-uri=http://localhost:8080/login/oauth2/code/<client-id>
spring.security.oauth2.client.provider.<client-id>.authorization-uri=<authorization-uri>
spring.security.oauth2.client.provider.<client-id>.token-uri=<token-uri>
spring.security.oauth2.client.provider.<client-id>.jwk-set-uri=<jwk-set-uri>
spring.security.oauth2.client.provider.<client-id>.user-info-uri=<user-info-uri>
spring.security.oauth2.client.provider.<client-id>.user-name-attribute=<user-name-attribute>

其中，<client-id>是OAuth客戶端的ID，<client-secret>是OAuth客戶端的密鑰，<authorization-uri>是授權頁面的URL，<token-uri>是令牌的URL，<jwk-set-uri>是JWK Set的URL，<user-info-uri>是用戶信息的URL，<user-name-attribute>是用戶名稱的屬性。

3. 創建授權回調處理器：創建一個類實現AuthenticationSuccessHandler接口，并實現onAuthenticationSuccess()方法，用于處理授權成功后的邏輯。例如：

public class OAuth2AuthenticationSuccessHandler implements AuthenticationSuccessHandler {

    @Override
    public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response, Authentication authentication) throws IOException, ServletException {
        // 處理授權成功后的邏輯
        // ...
    }
}

4. 配置授權回調處理器：在SecurityConfig類中配置授權回調處理器：

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    @Autowired
    private OAuth2AuthenticationSuccessHandler oauth2AuthenticationSuccessHandler;

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
            .authorizeRequests()
                .antMatchers("/login").permitAll()
                .anyRequest().authenticated()
                .and()
            .oauth2Login()
                .successHandler(oauth2AuthenticationSuccessHandler);
    }
}

5. 啟動應用程序：使用@SpringBootApplication注解標記啟動類，并添加@EnableOAuth2Client注解啟用OAuth2客戶端功能。例如：

@SpringBootApplication
@EnableOAuth2Client
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

6. 測試授權流程：啟動應用程序，并訪問授權頁面進行授權。授權成功后，將會執行OAuth2AuthenticationSuccessHandler類中的onAuthenticationSuccess()方法。

以上是使用Spring Boot實現OAuth服務的基本步驟，具體的實現細節和配置根據具體的需求和OAuth服務提供商的要求進行調整。